Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc528e51e35c0cfc…

MALICIOUS

PDF

84.3 KB Created: 2021-01-17 02:13:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5aa9c524c760cd39b54552bdcef3419b SHA-1: b8a95a42e4f2f919df5867e5ead5ee2a2fc941a7 SHA-256: dc528e51e35c0cfc5a437dff08a868b10c2c1fbb83f11964765ab43edfcd5b23
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link to a known malicious redirector URL, identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. ClamAV also detected the file as Pdf.Phishing.Trojan. The ML classifier and heuristics strongly indicate malicious intent, likely to lure users to a compromised site. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/123?utm_term=female+headshave+straight+razor In PDF document text
    • https://site-1166653.mozfiles.com/files/1166653/kgf_amma_song_tamil_lyrics.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393889/normal_5fcba361b3408.pdfIn PDF document text
    • https://bidovakufizal.weebly.com/uploads/1/3/4/5/134586087/vopewutuximev_zezoxiner_jirobowet.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374704/normal_5faaea9463e34.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388279/normal_5fac0b9f5e877.pdfIn PDF document text
    • https://gemaxudemaxepeb.weebly.com/uploads/1/3/1/0/131070646/2714978.pdfIn PDF document text
    • https://balesiloruj.weebly.com/uploads/1/3/4/6/134671801/263ca99acb75da3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489834/normal_5fecbb4f3e053.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tipakalif/step_brothers_parent_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/38433975263.pdfIn PDF document text
    • https://s3.amazonaws.com/vabemavuputenif/jr_ward_reading_list.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D55 5304 bytes
SHA-256: b021602b0f5bec609f20cb4b085b030b95664fd57993614c2186fec1686fb783
font_01_sfnt_off00011f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F3C 10928 bytes
SHA-256: b748b7da1b3130a837df139877dd8d034e5896c23812c8cad33bd79cfac04f74

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